clang-format: Improve && detection as binary operators.

Before:
  template <class T, class = typename std::enable_if<std::is_integral<
                         T>::value &&(sizeof(T) > 1 || sizeof(T) < 8)>::type>
  void F();

After:
  template <class T, class = typename std::enable_if<
                         std::is_integral<T>::value &&
                         (sizeof(T) > 1 || sizeof(T) < 8)>::type>
  void F();

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220805 91177308-0d34-0410-b5e6-96231b3b80d8